UPSC CDS 2 2020 Math Paper

Given for single brick L = 20 cm , b = 15 cm and h=10 cm
Volume of a brick = L.b.h
= 20×15×10 cm‌3
= 3000 cm‌3 Volume of the wall = length of wall × breadth of wall × height of wall
=4500×15×300 cm‌3
Hence total number of bricks required =

Volume of the wall

Volume of a brick

=

4500×15×300

3000

=6750